Lingenfelter L320030709 Lingenfelter CTS-V Intercooler Radiator Kit 2009-13 v1.1 - Manual (Page 18)

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53. From the front of the vehicle, feed the end
of the fan harness with the ground eyelets
through the gap between the radiator and
support rails on the passenger side of the
vehicle. Feed the harness until the fuse
holders are inside the engine compartment
and the relays, fan connectors and
temperature sensor connector are in front of
the radiator (roughly to the yellow arrow in
the image in step 52).
54. Feed the end of the harness with the coolant
temperature sensor connector behind the
impact bar and position the relays behind
the passenger side diagonal brace.
55. Connect the two fan connectors on the
harness to the fans mounted to the
intercooler radiator.
56. Connect the coolant temperature sensor
connector of the fan harness to the
temperature sensor installed in the
intercooler radiator.